Datasheet

Pin settings VIPER26
4/25 Doc ID 17736 Rev 2
3 Pin settings
Figure 3. Connection diagram (top view)
Note: The copper area for heat dissipation has to be designed under the DRAIN pins.
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Table 3. Pin description
Pin n.
Name Function
DIP-7 SO16
11-2GND
Connected to the source of the internal power MOSFET and controller
ground reference.
-4N.A.
Not available for user. It can be connected to GND (pins 1-2) or left not
connected.
25VDD
Supply voltage of the control section. This pin provides the charging current
of the external capacitor.
36LIM
This pin allows setting the drain current limitation. The limit can be reduced
by connecting an external resistor between this pin and GND. Pin left open if
default drain current limitation is used.
47FB
Inverting input of the internal trans conductance error amplifier. Connecting
the converter output to this pin through a single resistor results in an output
voltage equal to the error amplifier reference voltage (See V
FB_REF
on
Table 7). An external resistors divider is required for higher output voltages.
58COMP
Output of the internal trans conductance error amplifier. The compensation
network have to be placed between this pin and GND to achieve stability and
good dynamic performance of the voltage control loop. The pin is used also
to directly control the PWM with an
optocoupler. The linear voltage range extends from V
COMPL
to V
COMPH
(Table 7).
7,8 13-16 DRAIN
High voltage drain pin. The built-in high voltage switched start-up bias
current is drawn from this pin too.
Pins connected to the metal frame to facilitate heat dissipation.